1GSI:
reference: Cryophotolysis of caged compounds: a technique for trapping intermediate states in protein crystals., Ursby T, Weik M, Fioravanti E, Delarue M, Goeldner M, Bourgeois D, Acta Crystallogr D Biol Crystallogr 2002 Apr;58(Pt 4):607-14. PMID: 11914484

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